Certain bis(pyridinium quaternary salts)

ABSTRACT

THE DISCLOSURE RELATES TO NOVEL BIS(PYRIDINIUM QUATERNARY SALTS), A PROCESS FOR THEIR MANUFACTURE, COMPOSITIONS CONTAINING THEM, AND A METHOD OF PREVENTING THE GROWTH OF, OR KILLING, BACTERIA BY APPLYING ONE OF THE NOVEL PYRIDINIUM SALTS TO A BACTERIALLY INFECTED ENVIRONMENT.

United States Patent Oflice 3,786,058 Patented Jan. 15, 1974 3 786 058 CERTAIN BIS(PYRIDl1 lIUli I QUATERNARY SALTS) Philip Neil Edwards, Macclesfield, England, assignor to {mplerial Chemical Industries, Limited, London, Eng- 11 No Drawing. Filed Mar. 14, 1972, Ser. No. 234,648 Int. Cl. C07d 31/48 US. Cl. 260-294.8 R 14 Claims ABSTRACT OF THE DISCLOSURE This invention relates to novel pyridine derivatives which possess valuable antibacterial properties and some of which are useful in dental hygiene for inhibiting the formation of dental plaque.

According to the invention there is provided a pyridine derivative of the formula:

il y 1L232 wherein R and R which may be the same or diflierent, are each an alkyl, alkenyl, alkoxyalkyl, alkoxyalkoxyalkyl, alkanoyloxyalkyl or aryloxyalkyl radical of at least 6 and not more than 14 carbon atoms, a phenyl or naphthyl radical containing to 3 halogen atoms, or an alkyl radical of 1 to 3 carbon atoms which is substituted by a phenyl or naphthyl radical which is itself substituted by 0 to 3 halogen atoms or alkyl or alkoxy radicals of 1 to 6 carbon atoms; A and A which may be the same or different, are each a direct linkage or a linking group of the formula --CH CO.NH- wherein the methylene radical is joined to the pyridine nitrogen atom; (X .X represents two monoanions or a dianion; and A is a linking group selected from (2) CH:CH-

(3) --CH O(CH provided that both ns are not 0,

(4) --(CH .N(COR (CH wherein R is an alkyl or aryl radical of up to carbon atoms, and provided that both ns are not 0,

whereinnisO,1or2;niis0to12;xis0toZ;yis0 or 2 to 6; z is 2 or 3; Y is a phenylene or naphthylene radical; and Z is a straightor branched-chain alkylene radical of 2 to 8 carbon atoms.

When R and R are alkyl, alkenyl, alkoxyalkyl, alkoxyalkoxyalkyl, alkanoyloxyalkyl or aryloxyalkyl radicals, they are preferably straight-chain such radicals, for example n-octyl, n-nonyl, n-decyl, n-undecyl, n-dodecyl, n-tetradecyl, n-undec-lO-enyl, Z-n-hexyloxyethyl or 2-(2- buotoxyethoxy)ethyl radicals. When R and R are phenyl or naphthyl radicals containing 0 to 3 halogen atoms, or are alkyl radicals of 1 to 3 carbon atoms substituted by a phenyl or naphthyl radical which is itself substituted by 0 to 3 halogen atoms or alkyl or alkoxy radicals of 1 to 6 carbon atoms, such halogen atoms may be, for example, chlorine or bromine atoms, and the alkyl radical of 1 to 3 carbon atoms may be, for example, the methyl radical, so that R and R may be, for example, 3,4-dichlorophenyl, 4-chlorobenzyl, 2,4-dichlor0benzyl or 2- na-phthylmethyl radicals.

When (X .X represents two monoanions, suitable anions are, for example, halide anions, for example chloride or bromide anions, anionsderived from a carboxylic acid, for example the acetate anion, or anions derived from a sulphonic acid, for example the methanesulphonate or toluene-p-sulphonate anions; and when (X .X represents a dianion, a suitable anion is, for example, the sulphate or phosphate anion.

It is to be understood that although (X X represents two monoanions or a dianion, the corresponding monovalent radicals or atoms are'X and X and the corresponding divalent radical is (X .X Thus, for example, X and X may each be chlorine or bromine atoms, or methanesulphonyl, toluenesulphonyl or acetoxy radicals, and (X .X may be, for example, the sulphate divalent radical.

A suitable phenylene or naphthylene radical is, for example, the o-phenylene, m-phenylene, p-phenylene, 1,4- naphthylene, 1,5-naphthylene, 4-methyl-1,2-phenylene, 2,5 dimethyl-1,4-phenylene, 2,5-dimethoxy-1,4-phenylene or 2,4,5,'6-tetrachloro-1,3-phenylene radical.

A suitable value for Z is, for example, the ethylene, trimethylene, hexamethylene or 2,2-diethy1trimethylene radical.

Preferred linking groups A are those numbered 1, 2, 6, 8, 9, 11, 12, 14, 15, 17, 18, 23, 24, 25, 26, 27, 28 and 29 in the list above, and of these, groups A are:

particular linking CH: C -CO.NHNH.CO (CH2)4CO.NHNH.CO

(2 CO.N N.CO-

-CO.NHNH.CO- (9,1/=0.) --CO.NH(CHz)2-NH.CO (9, y==26.)

-o own-4130 o- (11, Y=1,2-phenylene.

( Y=1,4-pheny1cne.)

Preferred compounds of the invention are those wherein the radicals A R and -A R are the same, and a preferred group of pyridine derivatives of the invention comprises those compounds of the Formula I above wherein A and A are each a direct linkage, R and R are each the same alkyl or alkenyl radical of 8 to 11 carbon atoms, (X .X represents two bromide, chloride, methanesulphonate, toluene p sulphonate or acetate anions, or the sulphate dianion, and A is:

NH.COO (CH NH.CO.NH or A particularly preferred sub-group within the above group comprises those compounds wherein A and A are each a direct linkage, R and R are each an unbranched alkyl radical of 8 to 11 carbon atoms, optionally containing a terminal double bond, (X .X represents two bromide, chloride, methanesulphonate, toluene-p-sulphonate or acetate anions, or the sulphate dianion, and A is the trimethylene or ureylene radical or a radical of the formula NH.CO(CH CO.NH, and especially those compounds wherein A is linked to the same numbered carbon atom of each pyridine ring.

Particular new pyridine derivatives of the invention are described in Examples 1 to 4, and of these, individual, specially preferred derivatives are 4,4'-trimethylenebis(l-n-decylpyridinium methanesulphonate) (Compound 5);

3,3'-ureylenebis( l-n-decylpyridinium methanesulphonate) (Compound 25);

3,3-ureylenebis(1-n-decylpyridinimum chloride) (Compound 26);

3,3-glutaramidobis( l-n-decylpyridinium chloride) (Compound 78);

3,3'-glutaramidobis( l-n-decylpyrdinium methanesulphonate) (Compound 79);

3, 3 '-adipamidobis l-n-decylpyridinium methanesulphonate) (Compound 30);

4,4-adipamidobis(l-n-decylpyridinium methanesulphonate) (Compound 82);

3,3'-pimelamidobis l-n-decylpyridinium chloride) (Compound 86);

3,3'-suberamidobis(l-n-decylpyridinium chloride) (Compound 87);

3,3'su'beramidobis(1-n-decylpyridiniurn methanesulphonate) (Compound 88);

3,3'-azelarnidobis( l-n-decylpyridinium methanesulphonate) (Compound 90);

3,3 -sebacamidobis l-n-octylpyridinium methanesulphonat-e) (Compound 31); and

3,3'-sebacamidobis(l-n-decylpyridinium methanesulphonate) (Compound 32). According to a further feature of the invention there is provided a process for the manufacture of the novel pyridine derivatives of the invention which comprises:

(a) The quatemization of a pyridine derivative of the formula:

N N (II) with a quaternizing agent or quaternizing agents formula:

e f N (III) with a quaternizing agent (R A ).X wherein A A A R R X and X have the meanings stated above; or

ooonxxu A R (IV) or a reactive derivative thereof, with a suitable monobasic or dibasic compound, or the reaction of an amine of the formula:

A R (V) with a suitable monoor di-carboxylic acid, or a reactive derivative thereof wherein A R X and M have the meanings stated above; or

(d) For those compounds wherein the linking group A contains one or two urea linkages, the reaction of an amine of the Formula V with a monoor di-isocyanate, or the reaction of an isocyanate of the formula:

onnmrvoorxu AIR! (V I) Wherein A R X and n have the meanings stated above, with a suitable monobasic or dibasic compound; or

(e) For those compounds wherein the linking group A contains one urea linkage and which are symmetrical, the reaction of an amino compound of the Formula V wherein A R X and n. have the meanings stated above, with a carbonyl compound of the formula (R .CO, wherein R is a chlorine atom, a lower alkoxy radical or a phenoxy radical; or

(f) For those compounds wherein the linking group A contains two urethane linkages, the reaction of an amino compound of the Formula V with a suitable bischloroformate ester, or the reaction of a chloroformate ester of the formula:

A R (VII) wherein A R X1 and n have the meanings stated above, with a suitable dibasic compound; or

(g) For those compounds wherein the linking group A contains two urethane linkages, the reaction of a hydroxy compound of the formula:

A R (VIII) with a suitable di-isocyanate, or the reaction of an isocyanate of the formula:

r UR (IX) with a suitable dihydroxy compound wherein A R X and n have the meanings stated above; or

(h) For those compounds wherein the linking group A contains one or two olefinic linkages, the reaction of an activated methylpyridinium salt of the formula:

J UR (X) wherein A R and X have the meanings stated above, with a suitable monoor di-aldehyde;

whereafter if desired a product thus obtained containing an anion (X 0 (X or (X .X is converted to a corresponding compound containing a different anion (X (X or (X .X by basification thereof followed by reaction of the basified. product with an acid HX I-IX or H (X .X wherein X X X and X have the meanings stated above, or by an ion-exchange resin.

The quaternization process is preferably carried out by heating together the pyridine derivative and quaternizing agent, and the inclusion of a solvent, for example nitrobenzene, sulpholane or toluene, is often advantageous in improving the mutual solubilities of the reactants, or to moderate the reaction. The addition of a tertiary amine, for example a hindered tertiary amine such as didsopropylethylamine is also useful, for removing any acid generated during the reaction.

The processes (c) to (h) for the formation of amide, urea, urethane or olefin linkages may be carried out in generally known manner described in the literature for analogous compounds.

A suitable strong acid HX HX or H (X .X has a pK value of less than 2, and is, for example, hydrochloric, hydrobromic, methanesulphonic, toluene-p-sulphonic or sulphuric acid.

As stated above, the new compounds of the invention possess valuable antibacterial properties, in that they are effective against a wide range of both Gram-positive and Gram-negative organisms, including strains of, for example, Pseudomonads which are resistant to other widelyused antibacterial agents. Further advantages of the preferred compounds of the invention may include, for example, rapid speed of kill, being bactericidal rather than bacteristatic, not being deactivated by hard water, or having more surface activity. Further, textile materials which have been in contact with the compounds of the invention are not stained by treatment with hypochlorite bleach.

Thus, according to a further feature of the invention, there is provided a composition comprising at least one pyridine derivative of the invention together with an inert diluent or carrier.

The composition of the invention may be a pharmaceutical composition, for example in the form of a lozenge suitable for oral administration, or an ointment, cream, or sterile aqueous or oily solution or suspension for topical use; or it may be a non-pharmaceutical composition, in the form of, for example, a non-sterilized suitable for use as an antiseptic and containing from 0.02 to 1.0% w./v. of a compound of the invention, an aqueous solution in the form of a concentrate containing from 1% w./w. to that percentage which gives a saturated solution of a compound of the invention, or powder or tablets for dissolution in water to give an aqueous solution suitable for use as an antiseptic. Preferred compositions for use in dental hygiene are mouthwashes containing between 0.05% and 0.5% w./v. (at user dilution) of a compound of the invention; and toothpastes and dental gels containing between 0.05% and 1.0% w./w., preferably between 0.1% and 0.5 w./w., of a compound of the invention.

The invention is illustrated but not limited by the following examples:

EXAMPLE 1 General procedure for quaternization The pyridine derivative (0.01 mole) and the alkylating agent (0.02-0.1 mole) are heated together, optionally with inclusion of a solvent, e.g. nitrobenzene to improve the mutual solubilities, or to moderate the reaction, and/ or a hindered amine, for example di-isopropylethylamine to remove any acid generated during the reaction. The temperature and time of heating are shown for each compound in the tables, but these are not necessarily optimal conditions and they can usually be varied over wide ranges. The product is crystallized from a suitable solvent and, if required, the anion can be changed by conventional procedures, for example by the use of ionexchange resins.

@A I .(XLXfe n h r .LR .AJRJ

First Second Number A =A R =R linkage A" linkage X =X 1-.- n-Octyl 4 CH:CH3- 4 a 2 n-Deeyl 4 OH,CH, 4 Ms 3 n-Dodecyl. 4 --CH2CHl' 4 Ms n-Octyl- 4 r)s 4 MS n-Decy 4 (CH2)3- 4 Ms n-Dodecyl 4 (CH,); 4 M n-Tetradecyl 4 -(CH2):- 4 Br n-Decy 4 CH:CH- 4 Ms n-Undecyl 4 CH:CH- 4 Br n-Dodeeyl 4 CH:CH- 4 Ms 3,4-dichlorophenyL- 4 -CH:CH- 4 C1 n-Octyl. 2 OH:CH 2 Ms n-Decy 2 CH:CH- 2 Ms n-Octyl. 3 CH:CH- 3 Ms n-Deey 3 -CH:CH- 3 Ms n-Dodecyl 3 -CH:CH- 3 Ms n-0ety1. 3 -OH:CH- 4 M n-Deey 3 CH:CH- 4 Ms 2-n-hexyloxyethyl-.. 3 -OH:OH- 4 Ms 4chlorobenzyl. 3 CH:OH- 4 C1 2,4-diehlorobenzyl..; 3 -CH:CH 4 Cl 22 z-naphthylmethyl... 3 -CH:CH 4 Br n-Decy 2 OH:CH 3 Ms n-Octyl. 3 -NH.CO.NH 3 Ms n-Decy 3 NH.CO.NH- 3 Ms 3 -NH.CO.NH- 3 Cl 3 -NH.C0.00.NH- 3 Ms 3 -NH.CO(CH:):CO.NH- 3 Ms 3 NH.CO(CH|)4CO.NH- 3 Ms 3 NH.CO(CH:)4CO.NH 3 Ms 3 NH.OO(CHa)aCO.NH 3 Ms 3 -NH.CO(CH1)aCO.NH- 3 Ms 3 -CH:.NH.CO.NH.CH: 3 Br 3 -OH:.NH.C0(CH|):CO.NH.CH;- 3 Ms 3 --CH2.NH.CO(CH:)|CO.NH.CHr- 3 Ms 3 -NH.CO- 3 Ms 3 -NH.OO- 3 Ms 3 -NH.CO- 4 Ms 3 -NH.OO- 4 Me 40 3 -CHz.NH.CO 3 M5 41... 3 -CH1.NH.CO-- 3 Ms 42.-.. 2 -CH1.NH.CO- 3 Ms 43 2 CH,.NH.CO- 3 Ms 44--. 3 CH;.NH.OO- 4 Ms 45--- 3 -CH:.NH.CO- 4 Ms 46 2 OH,.NH.CO- 4 Ms 47--.. 2 CHa.NH.CO- 4 Ms 43 4 --CO.NH(OH:):NH.CO- 4 Ms 4 -CO.NH(CH:)1NH.CO- 4 Ms 4 CO.NH(CH:)|NH.C0 4 Ms I Linkage of left hand pyridine ring to A in the formula as written at the head of the table. b Where A is not symmetrical, it should be read as from left to right in the formula at the head of the table. a Linkage of A to right hand pyridine ring in the formula as written at the head of the table.

Ms=methanesulphonate.

The methylene group is attached to the pyridine nitrogen atom, and the NH group is attached to R.

Reaction conditions Tempera- Time, ture,C. minutes Additive M.P.( C.)

I Decomposition.

b Approximate M.P., compound very hygroscopic. v DIE=di-isopropylethylamine.

d Not crystalline.

Certain of the unquaternized pyridines, wherein A is an amide containing linkage, used as starting materials 10 for the above compounds are novel, and may be obtained by the following process which exemplifies the preparation of the unquaternized pyridine starting material for compounds and 41:

Nicotinoyl chloride (14.15 g.) was added over ten minutes, with stirring and cooling in an ice bath, to a solution of 3-aminomethylpyridine (10.8 g.) and triethylamine (10.1 g.) in methylene chloride ml.). After the addition was complete, the mixture was stirred at room temperature for an hour, diluted with water ml.), and the product was isolated from the organic phase by evaporation of the solvent. The crude product was recrystallized from ethyl acetate, M.P. 104-106 C.

The following starting materials were prepared similarly, using the appropriate acid chlorides and amino compounds:

Starting material for The unquaternized pyridine starting material for Compound 32 is also a novel compound and may be prepared as follows:

3-aminomethylpyridine (10.8 g.) and diphenyl carbonate (10.7 g.) were mixed, heated together at C. for five minutes, and the mixture was cooled and stirred with ether. The product was filtered 0E, washed with fresh ether, and recrystallized from ethyl acetate, M.P. 130.5-133.5 C.

EXAMPLE 2 The process described in Example 1 is repeated, using the appropriate bis-pyridine derivatives and quaternizing agents, to give the following compounds:

First Second No. A1=A2 R TE linkage A linkage X1=X 51 CH CO.-NH- n-Octyl 4. CHz-CHz- 4 01 52 -oHico-NH- n-Decyl 4 -0H2-0H2 4 01 53 n'Nony lh '1 i figgiggfl i $3 -3,5.5-t n1 2 nat? y 4 -co-NHNH-o0 cH. .-oo-NHNH-oo-..-.. 4 Ms as an a 3 Ms -CHCO-NH; 3 Sameasabove 3 Cl aaa'aa 2 -22 2a 0 2 on 2 s 'o'o-NnNn-oo- 3 Ms m a -CO-NH(CHz)4NH-CO- 3 Ms 62 fin a 3 Ms --CO-NH NH-oofl 3 3 MS TABLE-Continued First; Second No. A =A R =R Linkage A Linkage X =X 65 (in 3 -NH-CO-NH(CH2)aNH-CO-NH- 3 Ma 66. 3 -NH-CO-NH(CH2)4NH-CO-NH 3 Ms 67 do 3 -NH-CO-NH(CH2)NH--CO'NH 3 Br 68 do 3 CH2NH'CO'NH(CH2)6'NH'CONHCHI 3 Br 69 n-Nonyl 3 NH-CO-NH- 3 Ms 7n n-Decy 4 -NH-CO-NH 4 Ms 71 Undec-lO-enyl 3 -NH-CO-NH- 3 Ms CHzOO.-NH Octyl 3 NH.CO.NH- 3 Cl -'CH2CO.NH 3 NH.CO.NH- 3 Cl --CH2CO.-NH 3 NH.CO.NH 3 Cl n-Decyl 3 NH.CO.NHCH 3 Ms do-.- 3 NH OO.NHCH7.- 4 Ms 77.. -.d 3 NHCOCHgCONH 3 Ms .do.- 3 NH.CO(GH1)3OO NH- 3 C1 (10-. 3 NH.OO(CH2)3CO.NH 3 Ms n-Nonyl 3 --NH.CO(CH)4CO.NH 3 MS 2-hexyloxyethyl 3 NH.CO(CH2)4CO.NH- 3 Ms n-Decy 4 -NH.CO(CH:)4C0 NH- 4 Ms nctyl 3 -NH.CO(CH )4CO NH- 3 Cl Undee-10-enyl 3 NH.CO(CH:)4CONH 3 Ms nDeoyl 3 NH.CO(CH:)4OO NH- 3 01 do 3 NH.OO(CH)5CO.NH 3 Cl .do 3 NH.CO(CH2)0CON 3 01 do. 3 NH.CO(CH:)CON 3 Ms do 4 NH.CO(CH2)CO NH- 4 Ms do--- 3 NH.COEGH:)1CONH- 3 Ms do... 2 NH.CO CHghCO 2 Ms 2-(2-butoxyethoxy)ethyl.-. 3 --NH.CO(CHr)aCO-NH 3 Ms n-Decy 4 CH2NH.CO(CH2)ICO. C 4 Ms n-Decyl 3 -NH.COO(CH:)zOCO-NH.. 3 Ms n-Decyl 3 'NH.COO(CH2)3OCO.NH 3 Ms n-Deoy 3 NH.OOO(OHmOCO.NH- 3 Ms n-Decy 3 -NH.COOCH2C(C:Hs)2CH:OCO.NH--... 3 Ms 98-. n-Decy 3 NH.CO[O(CHg)z]h0CO.NH- 3 Ms 99 3,5,5-trimethylhexyl 3 NH.C0 4 Ms B Linkage of left hand pyridine ring to A in the formula as written at the head of the table.

9 Where A is not symmetrical, It should be read as from left to right in the formula at the head of the table.

e Linkage of A "to the right hand pyridine ring in the formula as written at the head of the table.

d The methylene group is attached to the pyridine nitrogen atom, and the NH group is attached to R.

' Ms=methanesulphonate.

obtained from the reaction of an appropriate amine and an appropriate acid chloride by the process described in Reaction conditions 3 5 Temp? the latter part of Example 1.

ture, Time,

0. minutes Additive M P. C

no Starting material 110 for Compounds Nos. M.P. C.) 132 275-278 160 58 198-1995 {38 62 160-163 110 63 301-303 32 64 3045-308 150 189-191 123 77 221-2245 195 78/79 190-1925 $33 82 280-281 E8 86 206-2085 145 87/88 1715-1735 lg 89 1995-2015 90 158-160 i 91 133.5- 180 93 139-141 180 160 (B) Certain other of the unquaternized pyridines, 128 wherein A is a ureido-containing linkage, used as starting materials for the preparation of the above compounds of 12% the invention, are novel and may be obtained as follows: 130 15 A solution of hexamethylene di-isocyanate (1.68 g.) igg %3 9 DIE ,123 in toluene (10 ml.) was added to a solution of 3-amino- 140 5 I gas-9415 pyridine (1.88 g.) in toluene (18 ml.) and the mixture fig was heated on a steam-bath for 10 minutes. The mixture r23 13 4 132 65 was cooled, and the product was filtered 01f, washed with toluene and dried, to g1ve 1,6-bis[3-(pyrid-3-yl)u@do] 1 lfiglgg hexane, M.-P. 197-199 C., the starting material for Com- 140 137-139 Pound g In a similar manner, using B-aminomethylpyridine in 140 90,93 70 place of 3-aminopyridine, there was obtained the starting material for Compound 68, 1,6-bis[3-(pyrid-3-ylmethyl) ureid01hexane, M.P. 223-225 C.

(C) Certain other of the unquaternized pyridines, wherein A is a ureidoor urethane-containing linkage, used as starting materials for the preparation of the above compounds of the invention, are novel and may be obtained as follows:

A solution of tetramethylene diamine (0.535 g.) in toluene ml.) was added with stirring and cooling to a solution of 3-pyridyl isocyanate (1.46 g.) in toluene ml.). The mixture was stirred until the reaction was complete, and the product was filtered off, washed with toluene and crystallized from ethanol to give 1,4-bis[3- (pyrid-3-yl)ureido]hexane, M.P. 218-219 C., the starting material for Compound 66.

In a similar manner, using the appropriate isocyanate and the appropriate amine, diamine or diol, the following starting materials were prepared:

Starting material EXAMPLE 3 The process described in Example 1 is repeated using the appropriate bis-pyridine derivates and quaternizing agents, to give the following compounds:

14 EXAMPLE 4 The methanesulphonate salt, Compound 32 (3 g.) was dissolved in water and excess 2 N sodium hydroxide was added. A yellow viscous oil separated which was extracted into chloroform. The chloroform layer was washed with water, and then shaken with excess aqueous toluene-psulphonic acid. Ether was added to precipitate the toluenep-sulphonate salt, which was crystallized from a mixture of acetone and acetonitrile, M.P. 127-129 C.

The sulphate was prepared in similar manner, M.P. 146-147 C.

The acetate ('M.=P. 87-89 C.) was prepared in similar manner, except that the new salt remained in the aqueous phase and was recovered by evaporation of the solvent and crystallization of the residue from acetone.

EXAMPLE 5 Compositions containing a pyridine derivative of the invention may be prepared from any pyridine derivative of the invention described in the foregoing examples by conventional procedures as illustrated below, where, it is to be understood, the particular pyridine derivative named may be replaced by an equipotent amount of any other pyridine derivative of the invention.

Lozenge A mixture of sucrose (92.5 g.), magnesium stearate (1 g.), gum acacia (3 g.), water (3 ml.) and 3,3'-suber a Linkage of left hand pyridine ring to A in the formula as written at the head of the table. b Where A is not symmetrical, it should be read as from left to right in the formula at the head of the table. Linkage of A to the right hand pyridine ring in the formula as written at the head of the table.

d t Indicates a trans double bond.

0 Ms=methanesulphonate.

The unquaternized pyridine derivatives used as starting materials in the preparation of Compounds 100 and 101 are novel, may be prepared by the process described in the latter part of Example 1, and have melting points of 321.5-322.5 C. and 117-119" C. respectively.

The unquaternized pyridine derivatives used as starting materials in the preparation of Compounds 1'03 and 104 are novel, may be prepared by the 1.1106685 described at (C) in Example 2, and have melting points of 121-123 C. and 194-1945 C. respectively.

The unquaternized pyridine derivative used as starting material in the preparation of Compound 109 may be obtained as follows:

Sodium hydride (1.32 g.) was added portionwise under an atmosphere of nitrogen during minutes, to a stirred solution of 3-hydroxypyridine (2.85 g.) in dry dimethylsulphoxide (28 ml.) cooled to below 25 C. When reaction ceased, 1,6-dibromohexane (3.66 g.) was added dropwise with stirring and cooling, and the resulting mixture was stirred a further 3 /2 hours. The mixture was poured into ice-water, and the precipitated product was filtered off and crystallized from petroleum ether (B.P. 60-80 C.), to give 1,6-bis-pyrid-3-yloxy-hexane, M.P. 85 C.

In a similar manner, using the appropriate dibromides, there were obtained the butane (M.P. 95 C.) and decane (M.P. 64 C.) analogues, the starting materials for Compounds 108 and 110 respectively.

amidobis(l-n-decylpyridinium chloride) (0.5 g.) is blended and compressed into hard lozenges such that each weighs 1 g., and contains 5 mg. of the antibacterial pyridine derivative.

Antiseptic 3,3 suberamidobis(1 n decylpyridinium methanesulphonate) (0.5 g.) is dissolved in sterile distilled water (99.5 ml.) to give a liquid composition suitable for use as an antiseptic.

Toothpaste A solution is prepared by stirring saccharin sodium (0.2 g.) in purified water (38.8 ml.) to which is then addetli)isopropanol (4.0 g.) and glycerin (20 g.) (Solution A mixture of oil of peppermint (0.6 g.) and oil of Spearmint (0.3 g.) is added to Pluronic P75 (0.6 g.- Pluronic is a trademark) followed by 4,4-glutaramidobis (l-n-decyl-pyridinium methanesulphonate) (0.5 g.) and stirring is continued until a homogeneous solution is formed (Solution II).

Solution I is slowly added to Solution II, with stirring, and Natrosol 250HH (1 g.--Natrosol is a trademark) is then added, stirring being continued until hydration is complete. A mixture of dicalcium phosphate (20 g.), Neosyl RT. (10 g.), titanium dioxide (1 g.) and dried aluminum hydroxide gel (1 g.) is then added and mixing is continued until a smooth and uniform paste is formed.

What I claim is: 1. A pyridine derivative of the formula:

wherein n is or 1; m is 0 to 12; and x is 0 or 1.

2. A pyridine derivative of claim 1 wherein A is a linking group selected from:

3. The pyridine derivative of claim 1 wherein R and R are the same and are each n-octyl, n-nonyl, n-decyl, nundecyl, n-dodecyl, n-tetradecyl, n-undec-lO-enyl, Z-n-hexyloxyethyl, 2-(2-butoxyethoxy)ethyl, 3,4-dichlorophenyl, 4-chlorobenzyl, 2,4-dichlorobenzyl or Z-naphthylmethyl.

4. The pyridine derivative of claim 1 wherein A and A are each a direct linkage, R and R are each the same unbranched alkyl of 8 to 11 carbon atoms, or unbranched alkyl of 8 to 11 carbon atoms containing a terminal double bond, (X .X represents two bromide, chloride, methanesulphonate, toluene-p-sulphonate or acetate 16 anions or the sulphate dianion, and A is a linking group of the formula NH.CO(CH CO.NH.

5. A pyridine derivative as claimed in claim 1, said derivative being 3,3'-adipamidobis(1 n decylpyridinum methanesulphonate) 6. A pyridine derivative as claimed in claim 1, said derivative being 3,3'-sebacamidobis(1 n octylpyridinium methanesulphonate 7. A pyridine derivative as claimed in claim 1, said derivative being 3,3'-sebacamidobis(1 n decylpyridinium methanesulphonate).

8. A pyridine derivative as claimed in claim 1, said derivative being 3,3 glutaramidobis(l-n-decylpyridinium chloride).

9. A pyridine derivative as claimed in claim 1, said derivative being 3,3'-glutaramidobis(l-n-decylpyridinium methanesulphonate 10. A pyridine derivative as claimed in claim 1, said derivative being 4,4 adipamidobis(l-n-decylpyridinium methanesulphonate 11. A pyridine derivative as claimed in claim 1, said derivative being 3,3-pimelamidobis(l-n-decylpyridinium chloride).

12. A pyridine derivative as claimed in claim 1, said derivative being 3,3 suberamidobis( l-n-decylpyridinium chloride).

13. A pyridine derivative as claimed in claim 1, said derivative being 3,3 suberamidobis(l-n-decylpyridinium methanesulphonate) 14. A pyridine derivative as claimed in claim 1, said derivative being 3,3 azelamidobis(l-n-decylpyridinium methanesulphonate).

References Cited UNITED STATES PATENTS 5/1966 Downes et al. 260-295 AM Q 6/1971 Braunholtz 260 -294.8 R

ALAN L. ROTMAN, Primary Examiner US. Cl. X.R.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,786,058 Dated January 15, 1974 Inventor(s) Philip Neil Edwards It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

In the heading of the patent, priority data should be added as follows:

--Claims priority, application Great Britain,

March 29, 1971, 807l/7l Signed and sealed this 24th day of June 1975.

(SEAL) Attest:

it. 11. o .IASOR Commissioner of Patents Attestlng Officer and Trademarks 

